The first stars formed about 300 million years after Big Bang in the most massive nebulae because ________
A) all of the nebulae at that time were massive and it was not until much later that smaller nebulae formed
B) the massive nebulae had enough gravity to attract star material early in the history of the universe
C) only the massive nebulae had the material needed to make stars
D) the massive nebulae had enough gravity to collapse and condense
E) it took that long for enough matter to form to make a star
D
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In an adiabatic process: a. sinking air cools
b. rising air warms. c. the temperature of an air parcel changes by exchanging heat with its surroundings. d. the temperature of an air parcel changes without exchanging heat with its surroundings.
In general, which area gets more precipitation, western MexAmerica or eastern MexAmerica?
A) Western MexAmerica gets more precipitation. B) Eastern MexAmerica gets more precipitation. C) Precipitation is fairly even from east to west. D) Actually northern MexAmerica gets more rain than southern MexAmerica.
What region of a continental margin blends into the deep-ocean basin?
a. Continental slope b. Continental shelf c. Continental basin d. Continental rise e. Continental plain
Peat is a brown lightweight unconsolidated deposit that ultimately can transform into ________.
A. coal B. crude oil C. shale D. bogolite E. swampstone